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How old would you be on other planets?

A planet's year is the time it takes to orbit the Sun once, so your age in planet years is the number of orbits you have completed. Someone who is 30 Earth years old is 124.5 on Mercury, 15.9 on Mars and 2.5 on Jupiter. On Pluto they would be 0.12.

The Earth seen from space, with North America in the center — The "Blue Marble 2012" view of Earth, a composite of swaths from the VIIRS instrument on NASA's Suomi NPP satellite taken on January 4, 2012. Image: NASA.

Your age on each planet

Date of birth

Pick a date of birth to see your age on each planet and your next birthday there.

Your age in each planet's years
Planet	Your age	Next birthday

Length of a year on each planet

Orbital periods and the age of a 30-year-old
Planet	Year length	In Earth years	Age if 30 on Earth
Mercury	88 days	0.24 Earth years	124.52
Venus	225 days	0.62 Earth years	48.77
Mars	687 days	1.88 Earth years	15.95
Jupiter	4,331 days	11.86 Earth years	2.53
Saturn	10,747 days	29.42 Earth years	1.02
Uranus	30,589 days	83.75 Earth years	0.36
Neptune	59,800 days	163.72 Earth years	0.18
Pluto	90,560 days	247.94 Earth years	0.12

Earth's year is 365.2 days. Mercury orbits in 88 days, so it has about four birthdays for each one on Earth. Neptune takes 164 Earth years to go round once, longer than any recorded human lifespan, so no one has ever been a year old there.

Sources and method

Orbital periods from the NASA Planetary Fact Sheet, accessed October 18, 2026. Ages use a year of 365.25 days on Earth. Your date of birth stays in your browser and is not sent anywhere.